This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 49 |
| 3 | 219 |
| 4 | 958 |
| 5 | 3860 |
| 6 | 15358 |
| 7 | 59939 |
| 8 | 232747 |
| 9 | 899307 |
| 10 | 3468816 |
| 11 | 13362322 |
| 12 | 51445648 |
| 13 | 197998075 |
| 14 | 761910893 |
| 15 | 2931606169 |
| 16 | 11279434226 |
| 17 | 43396799102 |
| 18 | 166963886874 |
| 19 | 642368646269 |
| 20 | 2471408829291 |
| 21 | 9508325156265 |
| 22 | 36581628609584 |
| 23 | 140741386091368 |